The "21st Century Educational Technology Primer" is a comprehensive textbook focusing on the ever-evolving field of educational technology. It provides insights and guidance for educators and e-learners alike. The book delves into essential topics such as collaborative learning, creating and evaluating instructional materials, fostering learning communities, and understanding system components. Additionally, it explores metadata creation and resource development, crucial in the digital age of education. This primer equips educators and learners with the knowledge and skills needed to effectively navigate the complex and ever-changing landscape of educational technology, making it an invaluable resource for those seeking to enhance the learning experience in the 21st century.